Question

sum of sequence 5+6+7+8....+19​

Answer 1

Step-by-step explanation:

Actually wt is ur question frnd

Answer 2

Answer:

180

Step-by-step explanation:

1 + 2+3 +.... +n=  $\frac{n(n+1)}{2}$

5 + 6 + 7 + .... + 19

= (1 + 2 + 3 + .... + 19) – (1 + 2 +3 + 4)

$\frac{19(19+1)}{2}$ −  10  = 180